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What is the starting equation for deriving the output equation of DC Machines?

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What is the starting equation for deriving the output equation of DC Machines?

(a) P = Generated Emf + Armature Current

(b) P = Generated Emf – Armature Current

(c) P = Generated Emf * Armature Current

(d) P = Generated Emf / Armature Current

This question was addressed to me in an international level competition.

The above asked question is from Design of Output Equations topic in division Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

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Best answer
The correct option is (c) P = Generated Emf * Armature Current

Best explanation: The first equation for deriving the output equation of DC machines starts from this equation. The generated emf is multiplied along with the armature current.

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